Final answer:
The powers of Congress have evolved from its early dominance to a more balanced role among the three branches of government, influenced by factors like judicial review and the inherent powers of the presidency, especially during wartime. The introduction of implied powers through the 'elastic clause' has allowed Congress to adapt to the growing complexity of governing the nation.
Step-by-step explanation:
The powers of Congress have transformed throughout American history, adapting to shifts in governance and balances of power within the federal structure. Originally, Congress was the dominant branch of government, but over time, the power dynamics between Congress and the other branches, particularly the executive branch, have fluctuated significantly.
During the early years of the republic, Congress's powers went largely unchallenged. This changed with landmark cases like Marbury v. Madison (1803), which established judicial review and gave the Supreme Court the power to declare laws unconstitutional. The presidency, at the onset, was weaker compared to Congress, but presidents have continually sought ways to expand their influence, often at the expense of congressional authority.
In the twentieth century, as the nation grew and required more regulation, the executive branch's ability to function in a hierarchical and more efficient manner gave it an advantage in power negotiations. Congress often found it necessary to delegate some of its authority to the executive, notably in areas like trade agreements and regulatory enforcement. As such, the balance of power continues to be a contentious and dynamic aspect of American government.